Admit it: You think the BBC's Doctor Who isn't quite as good as it was when your age was in single digits. Here's your chance to tell us just when it went wrong.

Yes, this poll is slightly tongue-in-cheek, but I've also tried to isolate a bunch of moments where the show's format changed significantly and semi-permanently. You could make case for any one of these being the show's shark-jump-of-no-return. What do you think — has the show managed to time-warp past the downsides of all of these changes?